Simulation of circulating fluidized bed combustors firing indigenous lignite

Date

2011-06-01

Author

Selçuk, Nevin

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

81
views

0
downloads

A comprehensive model, previously developed for a rectangular parallelepiped shaped 0.3 MW(t) circulating fluidized bed combustor (CFBC) fired with high calorific value coal burning in sand and validated against experimental data is adapted to cylindrical configuration and is extended to incorporate NO formation and reduction reactions and pressure drops around cyclone, downcomer and loop seal. Its predictive accuracy is tested by applying it to the simulation of Middle East Technical University (METU) 150 kW(t) CFBC burning low calorific value indigenous lignite with high Volatile Matter/Fixed Carbon (VM/FC) ratio in its own ash and comparing its predictions with measurements. Favorable comparisons are obtained between the predicted and measured temperatures and pressure profiles and emissions of gaseous species. Results reveal that predictive accuracy in pressure profile strongly depends on the correlation utilized for entrainment in dilute zone and that accuracy in NO emission requires data on partitioning of coal nitrogen into char-N and volatile-N and is affected significantly by dilute zone oxygen content. (C) 2011 Elsevier Masson SAS. All rights reserved.

Subject Keywords

Circulating fluidized bed, Turkish lignite, NOx emission, Mathematical modeling

URI

https://hdl.handle.net/11511/31622

Journal

INTERNATIONAL JOURNAL OF THERMAL SCIENCES

DOI

https://doi.org/10.1016/j.ijthermalsci.2011.01.022

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Modeling of NOx emissions from fluidized bed combustion of high volatile lignites Afacan, Onur; Gogebakan, Yusuf; Selçuk, Nevin (2007-01-01) A comprehensive model, previously developed and tested for prediction of behavior of continuous fluidized bed combustors is extended to incorporate NOx formation and reduction reactions and applied to the simulation of Middle East Technical University (METU) 0.3 MW Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) burning lignites with high Volatile Matter/Fixed Carbon (VM/FC) ratios in their own ashes. Favorable comparisons are obtained between the predicted and measured temperatures and concentrations ...
Simulation of circulating fluidized bed combustors firing indigenous lignite Özkan, Mert; Selçuk, Nevin; Department of Chemical Engineering (2010) A comprehensive model, previously developed for a rectangular parallelepiped shaped 0.3 MWt circulating fluidized bed combustor (CFBC) fired with high calorific value coal burning in sand and validated against experimental data is adapted to cylindrical configuration and is extended to incorporate NOx formation and reduction reactions and pressure drops around cyclone, downcomer and loop seal. Its predictive accuracy is tested by applying it to the simulation of Middle East Technical University (METU) 150 k...
Experimental investigation of fludized bed to be used as solar thermal energy storage Polat, Esra; Tarı, İlker; Department of Mechanical Engineering (2019) An air-granular particle fluidized bed system with dimensions of 0.08 m x 0.4 m x 0.08 m designed and analyzed experimentally and modeled with a commercial CFD software. The aim of the hydrodynamic and thermal experiments is validation of the numerical model previously developed by Serdar Hiçdurmaz. For this purpose, an experimental setup is built at METU and CFD model of Hiçdurmaz is modified for the new geometry with the same solution settings. First-order time discretization and Eulerian-Eulerian approac...
A Combined Experimental and Numerical Thermo-Hydrodynamic Investigation of High-Temperature Fluidized-Bed Thermal Energy Storage Mehrtash, Mehdi; Polat Karadiken, Esra; Tarı, İlker (2022-06-01) The present research describes the design, analysis, and modeling of an air-granular particle fluidized-bed system with dimensions of 0.08 m × 0.4 m × 0.08 m. The hydrodynamic and thermal experiments are designed to verify the numerical model previously created for this purpose. The gas-solid two-phase flow is described using a three-dimensional, two-fluid model based on the Eulerian–Eulerian method. The experiment is conducted, and the numerical model is updated for the new geometry while maintaining the s...
Modeling of reversible gamma/alpha transformations of low carbon steels in the intercritical temperature range Reti, T; Felde, I; Gür, Cemil Hakan (2004-10-28) A phenomenological kinetic model has been developed for the prediction of non-isothermal reversible incomplete transformations in low-carbon hypoeutectoid steels. The theoretical basis of the proposed method has its origin in a possible extension of the traditional Austin-Rickett kinetic differential equation. To critically assess the applicability of the model, a number of experiments based on computer simulations have been performed to predict the austenite/ferrite proeutectoid transformation in the tempe...

Citation Formats

N. Selçuk, “Simulation of circulating fluidized bed combustors firing indigenous lignite,” INTERNATIONAL JOURNAL OF THERMAL SCIENCES, pp. 1109–1115, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31622.